Add options for nova cell_v2

This patch adds the cell_v2 nova_cell0 database as part of the
test-install-nova.yml playbook. The var is required in test-vars for
this reason.

Additionally, we need to add permissions for the nova_api database user
to access the nova_cell0 database. This means we need to append
permissions for that user using the create-grant-db play. This defaults
to "omit" so is only used when "db_append_privs" is passed to the
include.

A work around is required for a bug in upstream nova - this should be
removed once https://review.openstack.org/#/c/428120/ merges.

Finally a fix was added to ensure the api_database is setup using the
appropriate address (although in this case it has no impact).

Change-Id: I082f37bb3ce61a900e06a58f21c7882f83671355

create-grant-db.yml

@@ -31,6 +31,7 @@
     host: "{{ item }}"
     state: "present"
     priv: "{{ db_name }}.*:ALL"
+    append_privs: "{{ db_append_privs | default(omit) }}"
   with_items:
     - "localhost"
     - "%"

test-install-nova.yml

@@ -55,10 +55,15 @@
       db_password: "{{ nova_container_mysql_password }}"
     - include: create-grant-db.yml
       db_name: "{{ nova_api_galera_database }}"
-      db_password: "{{ nova_container_mysql_password }}"
+      db_password: "{{ nova_api_container_mysql_password }}"
     - include: create-grant-db.yml
       db_name: "{{ nova_placement_galera_database }}"
       db_password: "{{ nova_placement_container_mysql_password }}"
+    - include: create-grant-db.yml
+      db_name: "{{ nova_cell0_database }}"
+      db_password: "{{ nova_api_container_mysql_password }}"
+      db_user: "{{ nova_api_galera_user }}"
+      db_append_privs: "yes"
   roles:
     - role: "{{ nova_rolename | default('os_nova') }}"
   vars_files:

test-vars.yml

@@ -155,6 +155,7 @@ nova_api_galera_database: nova_api
 nova_api_galera_user: nova_api
 nova_glance_api_servers: "{{ glance_api_servers }}"
 nova_container_mysql_password: "SuperSecrete"
+nova_api_container_mysql_password: "SuperSecrete"
 nova_developer_mode: true
 nova_galera_address: "{{ test_galera_host }}"
 nova_galera_database: nova
@@ -204,7 +205,7 @@ nova_placement_service_adminuri: "http://{{ test_nova_api_placement_host }}:8780
 nova_placement_service_adminurl: "{{ nova_placement_service_adminuri }}/placement"
 nova_placement_service_internaluri: "http://{{ test_nova_api_placement_host }}:8780"
 nova_placement_service_internalurl: "{{ nova_placement_service_internaluri }}/placement"
-
+nova_cell0_database: "nova_cell0"
 
 # Neutron specific settings
 neutron_container_mysql_password: SuperSecrete
@@ -463,3 +464,8 @@ pip_get_pip_force: no
 
 # Test install options
 install_test_packages: True
+
+# TODO: (andymccr)
+# This is to work around a bug: https://bugs.launchpad.net/nova/+bug/1661243
+# Current fix needs to merge: https://review.openstack.org/#/c/428120/
+nova_reserved_host_disk_mb: 0